## Algebra 1: Common Core (15th Edition)

$y=0.5x$
(Slope-intercept form is y=mx+b) (Find slope m using $m=\frac{change in x}{change in y})$ $m=\frac{4-2}{2-1}=\frac{2}{1}=2$ (Plug the slope and given data into y=mx+b) y=mx+b $1=.5(2)+b$ $1=1+b$ $0=b$ (0 times b is 0, so the final equation is just y=0.5x).